RoboFont is a UFO-based, mac only, font editor by Frederik Berlaen. The editor allows full scripting access to objects and interface. The application is a platform for drawing and modifying typefaces.
Glyphs is a Mac-only font editor developed by Georg Seifert. In contrast to other font editors Glyphs is built around the the concept of editing glyphs in a word context. All tools are optimized for a type design workflow as natural, quick, and easy as possible. There is no need for keeping a design version next to a production version of a font. The “font mastering” takes place automatically during export. By default, Glyphs automates a many technical details for the designer, but they can be overridden if needed.
Currently the app is offered as standard and Mini version.